The 3SB3501-6AA20 is a single pole changeover switch from Siemens. It has a 30mm phenolic housing and built-in auxiliary contacts. This model features an ON/OFF/ON switch design with red and green ON-markings, as well as a screw-type fastening system. It is rated up to 6A/250VAC and 4A/30VDC, and has a mechanical life of up to 600,000 cycles. This device is ideal for use in a wide range of domestic and industrial applications such as lighting, heating and ventilation control, and security systems.